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jit-compilation

Use when adding code generation with LLVM ORC or LLJIT, Cranelift, or dynasm, lazy compilation or inline caches, or fixing W^X faults. Not for AST-to-IR: use compiler-frontend.

.devin/skills/jit-compilation/SKILL.md

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# JIT compilation

## Contract

| Field | Bound contract |
|---|---|
| Trigger | A user adds a JIT hot path to an interpreter, compiles functions lazily on first call, embeds code generation in a REPL or engine, needs inline caches for polymorphic call sites, or hits symbol lookup, ABI, or W^X failures in JIT code. |
| Authority | Reversible local: writes only the JIT source files the user names inside the project and scratch build outputs; rollback is version control. No remote mutation. |
| Side effect | JIT source is created or edited, built, and executed on a test function whose result is checked. |
| Done | The chosen backend compiles a test function at runtime, the call through the returned pointer produces the expected value, and code memory is never writable and executable at the same time. |

## Inputs

1. Host language and backend (required): C++ with LLVM ORC or LLJIT, Rust with Cranelift, or Rust with `dynasm`. If undecided, step 1 chooses.